"Industrial Workers of the World." . . "Labor unions United States." . . "Syndicats." . . "Socialism in the United States." . . "Sindacati - Stati Uniti d'America." . . "Labor unions." . . "Industrial Workers of the World." . . . . . . . . . . . . . "Left wing unionism. A study of radical policies and tactics"@en . . . . . "Left Wing Unionism : A study of radical policies and tactics" . . . "Left wing unionism a study of radical policies and tactics" . . "Left wing unionism a study of radical policies and tactics"@en . . . . . . . "Left wing unionism : a study of radical policies and tactics"@en . "Left wing unionism : a study of radical policies and tactics" . . . . . . . . . "Left wing unionism : A study of radical policies and tactics" . . . . . "Left Wing Unionism" . . . . . . . . . . . . "Left wing unionism; a study of radical policies and tactics" . . "Left Wing Unionism : a study of radical policies and tactics" . "United States." . . "Socialism." . . "Communisme." . . . . "Socialism United States." . . "Socialisme." . .